/*
 * Copyright (C) 2021 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.nytimes.ohos.store.sample;

import io.reactivex.Scheduler;
import ohos.eventhandler.EventHandler;
import ohos.eventhandler.EventRunner;

import java.util.concurrent.Callable;

/**
 * HmSchedulers
 *
 * @since 2021-05-25
 */
public final class HmSchedulers {
    /**
     * MainHolder
     *
     * @since 2021-05-25
     */
    private static final class MainHolder {
        static final Scheduler DEFAULT = new HandlerScheduler(new EventHandler(EventRunner.getMainEventRunner()));
    }

    private static final Scheduler MAIN_THREAD = RxHmPlugins.initMainThreadScheduler(
            new Callable<Scheduler>() {
                @Override
                public Scheduler call() throws Exception {
                    return MainHolder.DEFAULT;
                }
            });

    private HmSchedulers() {
        throw new AssertionError("No instances.");
    }

    /**
     * mainThread
     *
     * @return Scheduler
     */
    public static Scheduler mainThread() {
        return RxHmPlugins.onMainThreadScheduler(MAIN_THREAD);
    }

    /**
     * mainThread
     *
     * @param eventRunner
     * @return Scheduler
     * @throws NullPointerException
     */
    public static Scheduler from(EventRunner eventRunner) {
        if (eventRunner == null) {
            throw new NullPointerException("eventRunner == null");
        }
        return new HandlerScheduler(new EventHandler(eventRunner));
    }
}
